package com.fishercoder.solutions;

/**
 * Given a non-negative integer c, your task is to decide whether there're two integers a and b such that a2 + b2 = c.

 Example 1:
 Input: 5
 Output: True
 Explanation: 1 * 1 + 2 * 2 = 5

 Example 2:
 Input: 3
 Output: False
 */
public class _633 {
    public boolean judgeSquareSum(int c) {
        if (c < 0) {
            return false;
        }
        int left = 0;
        int right = (int) (Math.sqrt(c));
        while (left <= right) {
            int curr = left * left + right * right;
            if (curr > c) {
                right--;
            } else if (curr < c) {
                left++;
            } else {
                return true;
            }
        }
        return false;
    }
}
